private void updateImmediately() {
   if (myProject.isDisposed()) return;
   checkNodeValidity((DefaultMutableTreeNode) myTree.getModel().getRoot());
   if (myUsagePreviewPanel != null) {
     myUsagePreviewPanel.updateLayout(getSelectedUsageInfos());
   }
 }
 private void restoreUsageExpandState(final Collection<UsageState> states) {
   // always expand the last level group
   final DefaultMutableTreeNode root = (DefaultMutableTreeNode) myTree.getModel().getRoot();
   for (int i = root.getChildCount() - 1; i >= 0; i--) {
     final DefaultMutableTreeNode child = (DefaultMutableTreeNode) root.getChildAt(i);
     if (child instanceof GroupNode) {
       final TreePath treePath = new TreePath(child.getPath());
       myTree.expandPath(treePath);
     }
   }
   myTree.getSelectionModel().clearSelection();
   for (final UsageState usageState : states) {
     usageState.restore();
   }
 }
 private void rulesChanged() {
   ApplicationManager.getApplication().assertIsDispatchThread();
   final ArrayList<UsageState> states = new ArrayList<UsageState>();
   captureUsagesExpandState(new TreePath(myTree.getModel().getRoot()), states);
   final List<Usage> allUsages = new ArrayList<Usage>(myUsageNodes.keySet());
   Collections.sort(allUsages, USAGE_COMPARATOR);
   final Set<Usage> excludedUsages = getExcludedUsages();
   reset();
   myBuilder.setGroupingRules(getActiveGroupingRules(myProject));
   myBuilder.setFilteringRules(getActiveFilteringRules(myProject));
   ApplicationManager.getApplication()
       .runReadAction(
           new Runnable() {
             @Override
             public void run() {
               for (Usage usage : allUsages) {
                 if (!usage.isValid()) {
                   continue;
                 }
                 if (usage instanceof MergeableUsage) {
                   ((MergeableUsage) usage).reset();
                 }
                 appendUsage(usage);
               }
             }
           });
   excludeUsages(excludedUsages.toArray(new Usage[excludedUsages.size()]));
   if (myCentralPanel != null) {
     setupCentralPanel();
   }
   SwingUtilities.invokeLater(
       new Runnable() {
         @Override
         public void run() {
           if (isDisposed) return;
           restoreUsageExpandState(states);
           updateImmediately();
         }
       });
 }
 public DefaultMutableTreeNode getModelRoot() {
   return (DefaultMutableTreeNode) myTree.getModel().getRoot();
 }